Texas Instruments TPS79333DBVRG4

Overview

TPS79333DBVRG4 from Texas Instruments is a 3.3-V fixed-output, 200-mA low-dropout linear regulator with enable and noise-reduction pin, optimized for RF and noise-sensitive analog circuits. It delivers 3.3 V ±2% output at up to 200 mA load, features 12 mV typical dropout at 10 mA (180 mV max at 200 mA), 70 dB PSRR at 10 kHz, and supports stable operation with only a 2.2-μF ceramic output capacitor. It is widely used in cellular transceivers and high-resolution ADC power rails.

For engineers reviewing the TPS79333DBVRG4 datasheet, TPS79333DBVRG4 pinout, TPS79333DBVRG4 application, or TPS79333DBVRG4 equivalent, key selection criteria include its ultra-low 32 μV_RMS output noise (with 0.1-μF NR cap), fast 50-μs startup time, <1 μA shutdown current, and SOT-23-6 package compatibility with space-constrained portable designs.

Technical Context

The TPS79333DBVRG4 employs a PMOS pass transistor architecture enabling near-zero reverse current and low dropout across full load range. Its internal 1.225-V bandgap reference feeds a precision error amplifier that regulates output via feedback from the NR pin and internal voltage divider - no external resistors required for fixed 3.3-V operation.

It integrates undervoltage lockout (UVLO) with 2.25–2.65 V threshold and hysteresis, active-high enable with 1.7 V min logic high, and thermal shutdown at ~165°C. The NR pin accepts an external capacitor (0–10 nF) to suppress internal reference noise, directly improving PSRR above 10 kHz and reducing integrated output noise by up to 25%.

Key Specifications

Pinout & Package

SOT-23-6 (DBV) package: 2.90 mm × 1.60 mm footprint, 1.3 mm height, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with TPS79333DBVR and MCP1703T-3302E/MB, the TPS79333DBVRG4 uniquely combines sub-35 μV_RMS noise, 70 dB PSRR at 10 kHz, and a dedicated NR pin - making it the only option among the three qualified for VCO biasing and high-SNR ADC reference supplies.

Availability

TPS79333DBVRG4 is available at Aetrix Electronics and suitable for RF transceiver modules, portable medical sensors, and high-fidelity audio subsystems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TPS79333DBVRG4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with over 90 years of innovation in high-reliability components.

The TPS793 family was designed specifically for noise-sensitive, battery-powered RF and precision analog systems - emphasizing ultralow noise, high PSRR, fast transient response, and minimal external component count.

FAQ

What is the minimum input voltage required for TPS79333DBVRG4 to regulate 3.3 V at 200 mA?

The TPS79333DBVRG4 requires VIN ≥ VOUT + VDO. With a maximum dropout voltage of 180 mV at 200 mA, the minimum input is 3.3 V + 0.18 V = 3.48 V. However, per datasheet recommended conditions, VIN must also be ≥4.3 V for guaranteed 3.3-V output regulation across temperature and process variation - this ensures margin for line/load transients and aging.

Can TPS79333DBVRG4 operate without the NR (noise reduction) capacitor?

Yes, the TPS79333DBVRG4 functions without an NR capacitor, but output noise increases significantly: from 32 μV_RMS (with 0.1 μF NR cap) to 55 μV_RMS (with 0.001 μF). PSRR above 1 kHz also degrades by 10–20 dB. For RF or high-precision analog use, TI specifies 0.01–0.1 μF on NR; omitting it compromises the core low-noise value proposition of the TPS79333DBVRG4.

Is TPS79333DBVRG4 pin-compatible with other TPS793 fixed-output variants in SOT-23-6?

Yes, all TPS793 fixed-output variants (e.g., TPS79328, TPS79330, TPS793475) in DBV (SOT-23-6) package share identical pinout, footprint, and thermal characteristics. Only the internal feedback network differs - enabling direct substitution when output voltage and load requirements align, provided input voltage headroom satisfies each variant's dropout and UVLO requirements.

What is the maximum allowable junction temperature for continuous operation of TPS79333DBVRG4?

The TPS79333DBVRG4 is rated for continuous operation up to TJ = 125°C. Thermal shutdown activates at ~165°C, but sustained operation above 125°C risks reliability degradation. With RθJA = 225.1°C/W (DBV package), ambient temperature must be limited - e.g., at 200 mA and 3.8 V input, power dissipation is ~100 mW, allowing ~100°C ambient before reaching 125°C junction.

Does TPS79333DBVRG4 support reverse current protection?

No, the TPS79333DBVRG4 uses a PMOS pass device with an inherent body diode that conducts reverse current when VOUT > VIN (e.g., during power-down). Reverse current is not internally limited and can exceed rated output current. For bidirectional systems, an external Schottky diode or ideal diode controller is required to block reverse conduction and protect upstream sources.